Rotatable cutting tool-tool holder-base assembly

Abstract

A cutting tool holder-base assembly ( 399 ) has a base ( 400 ). The base ( 400 ) is adapted to attach to a surface ( 40 ) of a rotatable driving member ( 38 ). The tool holder-base assembly ( 399 ) includes a cutting tool holder ( 500 ) with head region ( 502 ) containing a cutting tool bore ( 506 ), and a shank region ( 504 ) with a distal end ( 524 ). The shank region ( 504 ) has an alignment notch ( 528 ) presenting an alignment surface ( 530 ) at the distal end ( 524 ). The assembly ( 399 ) further has a base ( 400 ), which contains a tool holder bore ( 418 ) and a transverse passage ( 430 ) intersecting the tool holder bore ( 418 ). There is an elongate pin ( 436 ) in the transverse passage ( 430 ). The elongate pin ( 436 ) has an exposed portion ( 440 ) thereof passing through the tool holder bore ( 418 ) wherein the cutting tool holder ( 500 ) is able to enter completely the tool holder bore ( 418 ) of the base ( 400 ) when the alignment surface ( 530 ) is in alignment with the exposed portion ( 440 ) of the elongate pin ( 436 ).

What is claimed is: 
     
       1. A tool holder-base assembly wherein the base is adapted to attach to a surface of a rotatable driving member, the tool holder-base assembly comprising;
 a base; 
 the base contains a tool holder bore having a tool holder bore central longitudinal axis, the base further contains an orientation bore having an orientation bore central longitudinal axis, the orientation bore opens into the tool holder bore, the orientation bore central longitudinal axis being disposed generally perpendicular to the tool holder bore central longitudinal axis; 
 a tool holder having a leading head region and a trailing shank region, and a mediate region intermediate of and contiguous with the leading head region and the trailing shank region; 
 the leading head region of the tool holder contains a rotatably cutting tool bore; 
 the trailing shank region containing an orientation slot; 
 the mediate region presenting a forward protective surface defining debris diversion surfaces and wherein the forward protective surface comprising a pair of opposite lateral sections, and each one of the lateral sections containing a hard plate; and 
 an orientation pin received within the orientation bore so as to project into the orientation slot wherein the orientation pin cooperates with the orientation slot in the tool holder so the tool holder presents a correct orientation relative to the base. 
 
     
     
       2. A tool holder-base assembly according to  claim 1  wherein the base having a proximate region and a distal region, the proximate region having a surface that is attachable to the surface of the rotatable driving member, and the orientation bore opening at the proximate region of the base. 
     
     
       3. A tool holder-base assembly according to  claim 1  wherein the base having a proximate region and a distal region, the proximate region having a surface that is attachable to the surface of the rotatable driving member, and the orientation bore opening at the distal region of the base. 
     
     
       4. A tool holder-base assembly according to  claim 1  wherein the forward protective surface comprising a mediate rib surface containing a hard member. 
     
     
       5. A tool holder-base assembly according to  claim 1  wherein the tool holder bore having an open axial rearward end.